A comprehensive protector for electric motor

Abstract

The utility model belongs to motor protector technical field, specifically disclose a kind of motor comprehensive protector, comprising: current sampling circuit, leakage current sampling circuit, 4-20mA output circuit, RS485 output circuit, two-way relay output circuit, product power supply circuit, single-chip microcomputer, three-phase voltage sampling circuit, software burning circuit, nixie tube display and driving circuit, filter circuit, nixie tube circuit, output interface one circuit and output interface two circuit.In the case of guaranteeing voltage input signal and communication output isolation, voltage value is sampled.Two voltage transformers are used to isolate voltage signal from main control chip, and AB, BC voltage can be collected simultaneously, and AC voltage can be calculated.Sampling signal is isolated by transformer at sampling end, which eliminates the need for additional isolation components for communication part, human-machine interface and other parts.Also, there is no side effect of being unable to collect voltage using optocoupler isolation.

Description

Technical Field

[0001] This utility model relates to the field of motor protector technology, specifically a comprehensive motor protector. Background Technology

[0002] The voltage signal sampling section of the power supply protection has high voltage. If the power supply section and the sampling section of the main control chip of the phase sequence protector are connected, the chip will carry high voltage. The human-machine interface, communication lines and other output sections related to the chip must be isolated, which greatly limits the expansion of the additional functions of the phase sequence protector.

[0003] If the voltage signal is isolated by an optocoupler, the main control chip can only collect the switching signal. Although it can determine whether there is a problem with the phase sequence and realize phase sequence protection, it cannot measure the voltage value, which greatly reduces the product's competitiveness. Utility Model Content

[0004] The purpose of this invention is to provide a comprehensive motor protector to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a comprehensive motor protector, comprising: Current sampling circuit, leakage current sampling circuit, 4-20mA output circuit, RS485 output circuit, two-way relay output circuit, product power supply circuit, microcontroller, three-phase voltage sampling circuit, software programming circuit, digital tube display and driving circuit, filtering circuit, digital tube circuit, output interface one circuit and output interface two circuit. The product's power supply circuit output connects to two relay output circuits, a 4-20mA output circuit, a digital tube display and driving circuit, a microcontroller, a software programming circuit, a current sampling circuit, a leakage current sampling circuit, and a filter circuit. The current sampling circuit, leakage current sampling circuit, and three-phase voltage sampling circuit are connected to the microcontroller. Each AD sampling line of the filter circuit is connected in series with a 0.1uF capacitor and then grounded. The 4-20mA output circuit is connected to the microcontroller and the second output interface circuit. The first output interface circuit is connected to the two relay output circuits. The two relay output circuits are connected to the microcontroller, the RS485 output circuit is connected to the microcontroller and the output interface circuit, the digital tube circuit is connected to the microcontroller, the software programming circuit is connected to the microcontroller, and the output interface circuit is connected to the three-phase voltage sampling circuit.

[0006] Preferably, it also includes a buzzer circuit, which is connected to the microcontroller.

[0007] Preferably, the product also includes a button circuit, wherein the product power supply circuit is connected to the button circuit.

[0008] Compared with the prior art, the beneficial effects of this utility model are: This motor protector adds power protection functions (over / under voltage protection, phase sequence protection, phase loss protection) and integrates leakage protection. It features 4-20mA output and RS485 output. Voltage values ​​are sampled while ensuring isolation between the voltage input signal and the communication output.

[0009] Two voltage transformers are used to isolate the voltage signal from the main control chip. At the same time, the AB and BC voltages can be collected and the AC voltage can be calculated.

[0010] The use of voltage transformers isolates the signal terminal from the chip sampling terminal, so the chip no longer needs to be isolated from the communication section and the human-machine interface section.

[0011] Using a current transformer at the sampling end to isolate the sampled signal eliminates the need for additional isolation components for the communication section, human-machine interface, etc. It also avoids the side effect of being unable to sample voltage when using optocoupler isolation. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the current sampling circuit structure of this utility model; Figure 2 This is a schematic diagram of the leakage current sampling circuit structure of this utility model; Figure 3 This is a schematic diagram of the buzzer circuit structure of this utility model; Figure 4 This is a schematic diagram of the 4-20mA output circuit structure of this utility model; Figure 5 This is a schematic diagram of the RS485 output circuit structure of this utility model; Figure 6 This is a schematic diagram of the two-channel relay output circuit structure of this utility model; Figure 7 This is a schematic diagram of the power supply circuit structure of the product of this utility model; Figure 8 This is a schematic diagram of the button circuit structure of this utility model; Figure 9 This is a schematic diagram of the microcontroller circuit structure of this utility model; Figure 10 This is a schematic diagram of the three-phase voltage sampling circuit of this utility model; Figure 11 This is a schematic diagram of the software programming circuit structure of this utility model; Figure 12 This is a schematic diagram of the digital tube circuit structure of this utility model; Figure 13 This is a schematic diagram of the digital tube display and driving circuit structure of this utility model; Figure 14 This is a schematic diagram of the filter circuit structure of this utility model; Figure 15 This is a schematic diagram of the output interface circuit of this utility model; Figure 16 This is a schematic diagram of the output interface circuit of this utility model. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0015] Example 1: Please refer to Figure 1-6 This utility model provides a technical solution: a comprehensive motor protector, comprising: a current sampling circuit, a leakage current sampling circuit, a 4-20mA output circuit, an RS485 output circuit, a two-way relay output circuit, a product power supply circuit, a microcontroller, a three-phase voltage sampling circuit, a software programming circuit, a digital tube display and driving circuit, a filtering circuit, a digital tube circuit, a buzzer circuit, a key circuit, an output interface one circuit, and an output interface two circuit. The product's power supply circuit is connected to two relay output circuits, a 4-20mA output circuit, a digital tube display and driving circuit, a microcontroller, a software programming circuit, a current sampling circuit, a leakage current sampling circuit, and a filter circuit. The current sampling circuit, leakage current sampling circuit, and three-phase voltage sampling circuit are connected to the microcontroller. Each AD sampling line of the filter circuit is connected in series with a 0.1uF capacitor and then grounded. The 4-20mA output circuit is connected to the microcontroller and output interface circuit two. Output interface circuit one is connected to the two relay output circuits. The two relay output circuits are connected to the microcontroller. The RS485 output circuit is connected to the microcontroller and output interface circuit two. The digital tube circuit is connected to the microcontroller. The software programming circuit is connected to the microcontroller. Output interface circuit two is connected to the three-phase voltage sampling circuit. The buzzer circuit is connected to the microcontroller. The product's power supply circuit is connected to the button circuit.

[0016] This solution revolves around the STM32 microcontroller (such as...) Figure 9 (As shown) Core, according to power supply (product power supply circuit, such as...) Figure 7 (as shown) → Signal acquisition (current sampling circuit, leakage current sampling circuit, such as...) Figure 12 (As shown) → Control output → Interactive communication logic chain, the steps are as follows: 1. Power bus setup +12V: Output from the power module (ZP03S1200WA in the product's power circuit), connected to the relay circuit (anodes of diodes D1 and D2 in the two-way relay output circuit), the 4-20mA op-amp (U1C power supply in the 4-20mA output circuit), and the COM terminal of the digital tube driver (62003 in the digital tube display and driver circuit).

[0017] +3V3: Output from LD1117 (U1 of the product power supply circuit), connected to the VDD interface of the microcontroller, the MAX3072E of the RS485 output circuit, the software programming circuit, the button circuit, the AD sampling pull-up resistors (such as R3, R5, R7 of the current sampling circuit and the leakage current sampling circuit), and the filter circuit.

[0018] 2. Signal acquisition chain (voltage, current, leakage current) Three-phase current: After the 10Ω sampling resistors of phases A / B / C of the current sampling circuit are divided, AD2, 3, and 4 of the current sampling circuit are connected as follows: AD4→PA3, AD3→PA2, AD2→PA1 (microcontroller AD port).

[0019] Leakage current: After the 100Ω sampling resistor of the leakage current sampling circuit is divided, AD1 of the leakage current sampling circuit is connected as follows: AD1→PA0 (microcontroller AD port).

[0020] Three-phase voltage: The output of the ZMPT107 current transformer in the three-phase voltage sampling circuit is filtered and divided. The AD6 and 7 of the three-phase voltage sampling circuit are connected as follows: AD6→PA6, AD7→PA7 (microcontroller AD port).

[0021] Filtering: Each AD sampling line in the filtering circuit is connected in series with a 0.1μF capacitor and grounded to filter out noise.

[0022] 3. Control and Output Relays: The JDQ1 and JDQ2 output circuits of the two relays are connected as follows: JDQ1→PB8 (K1), JDQ2→PB9 (K2). The base of the driver transistor BC817 is connected to the microcontroller's I / O, and the relay coil is connected to +12V.

[0023] Buzzer: The BEEP→PA5 circuit of the buzzer circuit, with the capacitor grounded, enables sound control.

[0024] 4-20mA Remote Transmission: The 4-20mA output circuit uses the operational amplifier TLV9102, whose output IOUT is connected to the output interface two circuit J3. The microcontroller controls the output of the operational amplifier through signal conditioning.

[0025] RS485 Communication: The RS485 output circuit of MAX3072E has TX2→PB6, RX2→PB7, and DR→PB5 (where PB6, PB7, and PB5 are microcontroller interfaces), and A+ / B- are connected to the bus terminals of interface J3.

[0026] 4. Local interaction (display + burning) Digital tube: Connection method: Segment selection (A~G, P) → microcontroller PB0~PB2, PB10-PB14; Bit selection (COL0~COL5) → 01~06 of 62003 in the digital tube display and driving circuit (driver chips C0~C5 are connected to microcontroller PF7, PF6, PA13~P11, PA8), and COM of 62003 is connected to +12V.

[0027] Programming: The LOAD1 interface of the software programming circuit is connected as follows: TX1→PA9, RX1→PA10, RST→NRST, BOOT0→BOOT0, VCC / +3V3, GND common ground.

[0028] 5. Interface normalization Output interface circuit J1 (relay output): K1's COM1 / NO / COM2 / NC and K2's COM3 / J2 correspond to relay contacts, realizing the on and off of the load.

[0029] Output interface two circuit J3 (integrated interface): A / B / C / GND connect to the three-phase current transformer, A+ / B- connect to RS485, IOUT connect to 4-20mA, and K1 connect to the leakage current sampling terminal.

[0030] Core logic: Using STM32 as the central hub, power supply, AD acquisition of electrical parameters, relay / buzzer for protection, RS485 / 4-20mA remote transmission, digital tube / button local interaction, and filtering to ensure signal quality—forming a closed-loop motor protection system of "monitoring → judgment → control → feedback".

[0031] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It is obvious to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description. Therefore, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this utility model, and no reference numerals in the claims should be considered as limiting the scope of the claims.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A comprehensive motor protector, characterized in that, include: Current sampling circuit, leakage current sampling circuit, 4-20mA output circuit, RS485 output circuit, two-way relay output circuit, product power supply circuit, microcontroller, three-phase voltage sampling circuit, software programming circuit, digital tube display and driving circuit, filtering circuit, digital tube circuit, output interface one circuit and output interface two circuit. The product's power supply circuit output connects to two relay output circuits, a 4-20mA output circuit, a digital tube display and driving circuit, a microcontroller, a software programming circuit, a current sampling circuit, a leakage current sampling circuit, and a filter circuit. The current sampling circuit, leakage current sampling circuit, and three-phase voltage sampling circuit are connected to the microcontroller. Each AD sampling line of the filter circuit is connected in series with a 0.1uF capacitor and then grounded. The 4-20mA output circuit is connected to the microcontroller and the second output interface circuit. The first output interface circuit is connected to the two relay output circuits. The two relay output circuits are connected to the microcontroller, the RS485 output circuit is connected to the microcontroller and the output interface circuit, the digital tube circuit is connected to the microcontroller, the software programming circuit is connected to the microcontroller, and the output interface circuit is connected to the three-phase voltage sampling circuit.

2. The integrated motor protector according to claim 1, characterized in that: It also includes a buzzer circuit, which is connected to the microcontroller.

3. The integrated motor protector according to claim 1, characterized in that: It also includes a button circuit, and the product power supply circuit is connected to the button circuit.

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